Governor for elevators



(No Model.) Y

oi W. BALDWIN.v 1 GOVERNOR'FOR ELEVATORS. Patented July 2 5, 1882.

` UNITED STATES OYRUS VW. BALDWIN, OF CHICAGO, ILLINOIS.

GOVERNOR FOR ELEVATORS.

SPECIFICATION forming part of Letters Patent No. 261,652, dated July 25,1882. Application tiled June 6, 1882. (No model.)

To all lwhom it may concern Be it known that I, OYRUSW. BALDWIN, acitizen of the United States, and a resident of Chicago, Cook county,Illinois, have invented certain Improvements in Governors for Elevators,ofwhich the following is a specification.

My invention relates to that class of safety apparatus in which thesafety-brakes are operated through the medium of a rope'traveling withthe cage and clamped when the speed'b'ecomes excessive; and myinventionconsists of' simple but effective devices for arresting the rope, andalso of means for arresting the cagev should one only of thesuspension-ropes give way, as fully set forth hereinafter.

In the drawings, Figure l is a side view, showing the rope, car, and itsappliances and governor. Fig.2 is an inverted plan of Fig. 1, and Fig. 3is an edge view of the governor.

The car may be constructed and operated by steam, air, or water power inany suitable manner, and with the same are combined the usual hand-ropefor moving the valve, and brakes ofany suitable character.

I ha\'e shown, to illustrate my invention, brake-levers O C, attached toa lever, H, by rods j, the lever H connected to a link, h3, carryingapivoted nut, G, through which extends a screw, F, turning in bearingson the ear and carrying a drum, le, round which is wound theoperating-rope b.

At the top ofthe well, or in any othersuitable position, is placed thegovernor, consisting of a grooved pulley, E, to one side of which arepivoted arms c c, each arm being connected to a spring, f, that tends tohold the arm inward against a stop, c'. Round the pulley E passes thebrake-operating rope b, the other end of which is connected to a weight,W; but an endless rope passing round pulleys at the top and bottom ofthe well may be used.-

At any point adjacent to the periphery of the pulley is secured acatch-plate, Z. The arms e are so connected that during the ordinarymovements of the machine they will lie within the circumference of thepulley; but on any undue increase of speed they will fly out beyond theperiphery, andV upon one of them striking the plate l will `arrest themotion of the pulley, the rope b being then held stationary. As the ropeb ceases to travel with the cage it unwinds from the drum k, and therevolution of the latter and its screw-shaft F applies the brakes andarrests the motion ofthe cage, the nut Gr holding the clamps firmly inthe position to which they are set` even should the rope break. It willbe seen that the arms e are pivoted and arranged so that their free endsshall be forward in the direction in which the pulley rotates when thecage descends, so 6o that they will be very sensitive to anyvchange inspeed and be thrown out instantly should itincrease. To impartincreasedsensitiveness I extend bladesf from the arms, which meet with increasedresistance from the air as the speed of thepulley increases, and tend tothrow the arms outward.

Each suspension-rope g is connected to a frame inclosing the cage, andconsisting, as usual, of a cross-bar, h2, and side rods, h', and 7o therods at each side of the cage extend through a lever, H', pivoted by apin, x, toa bracket,

I, beneath the cage. The connections of the lever and rods'will permitthe lever to rock slightly, and are such as to maintain the levernormally in a horizontal position, with one end extending into a notch.fz, in a verticall lever,

J, hung to the bracket I, as shown. A springarm, lm, connected to theupper end ofthe 1e ver J, extends through bearings to the back of 8o thedrum lc, and by contact with a stop-pin, i,

on said drum prevents it from turning until on an undue increase ofspeed the friction upon the rope b becomes so great as to bend thespring-arm and permit the stop-pin to escape therefrom. Should eitherot' the cables or its attachments break (and it is almost impossible forboth to break simultaneously) the strain will come upon the other andtilt the 1ever H', its end being brought against one of 9o the inclinedfaces of the notch y, and thereby vibrating the lever J, so as to drawback the arm m away from the stop-pin i. The weight W now descends,drawing upon the rope b and revolving the drum k until the brakes areap- 9 5 plied and the car stopped.

I do not limit myself to the precise devices for releasing the drum uponthe breaking of one of the suspension cables or ropes, as otherreleasing appliances may be used, and the de- 10o vices will ofcourse bechanged with a change in the characterv of the brake appliances.

1. The withndescribed governor device for elevators, consisting ofapulley, arms pivoted thereto, springs connected to said arms, and astop-plate arranged to be struck by said arms When thrown beyond theperiphery ot' thepulley, substantially as specitied.

2. The combination, with the elevator and its operating-rope b, of thepulley E, arms c e, pivoted to the pulley, with their free endsin thedirection in which the pulley revolves when the cageis descending,springs, and stop-plate, substantially as set forth.

3. The combination of the pulley, stop, arms, and bladesf, substantiallyas speoitied.

4. The combination, with the brakes, governor, and rope b, of thescrewshaft F, drum k, and nnt G, connected to the brake-arms,substantially as specified.

5. Thecombination, withacage,ofindepeudent suspension-cables, brakes,and appliances constructed to apply the brakes upon the breaking ofeither cable, substantiallyr as set forth.

6. The combination,in an elevator, of suspension-cables connectedindependently to a lever, H, upon opposite sides of its pivot-point, andappliances constructed and operating to apply the brakes upon thetilting of the lever, substantially as set forth.

7. lThe combination ofthe ca ge,independent suspensioneables, lever H,drum k, rope b, weight W', governor E, and notched lever J, spring-rodn, and stoppin t on the drum, substantially as set forth.

In testimony whereof I have signed my name to this specification in thepresence of two snbscribing witnesses.

. GYRUS W. BALDWIN. Witnesses:

L. J. L. KENT, UoLMEs HOGE.

